- multiplying wheel
- 增速: speed increase; speed up
- 增速: speed increase; speed up◇增速传动 step-up drive; 增速齿轮 overdrive gear
- 变速轮: change pulley; change speed gear; change spur gear; change wheels; change-wheel; ratio gear; stud gear; variable speed wheel gear; variable-speed wheel gear
- 测速轮: tachometer wheel
- 差速轮: spider gear
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